Seems like they want us to help do some pest control. Cull the numbers before those 'Shades' reach the city.

[ It definitely makes sense to encourage the witches and monsters affected by the moon to blow off steam this way. This would kill two birds with one stone. The city has fewer inhabitants going feral, and the Shades are kept at bay. Jean doesn't particularly like putting himself in danger, but if it will protect the people inside the city, that gives him a bit more motivation. ]

Have you ever killed anything before?